Jareds 89 LX-i
03-04-2003, 09:42 PM
Alright this problem has got me stumped. I got my A/C fixed last week after it having it not working for about 3 years now. The A/C itself works GREAT (35 degrees! :D ), however, I keep getting a check engine light on certain occations. It ONLY comes on when the A/C is on, never when it's off. The first time I pulled the codes I got a code 6, which is engine coolant temperature sensor, but I believe that was an old code from when I had a wire break off one of the temp sensors. I pulled the clock/ECU fuse to reset it, and drove around for a couple more days. The light still came back on on several occations, so I went to pull the codes again tonight and there were no codes! Now the light usually only comes on when you're going slow, such as lots of traffic lights or stop signs, stuck in traffic, parking lots, etc. If I just get right on the highway and drive it won't come on at all. I used the a/c the entire time on my trip to Orlando the other day, and that was 3.5 hours there and 3.5 hours back, and the light never came on once, but as soon as I pull into a parking lot and drive slow for a couple minutes (on and off the gas/brake) there's Mr. CEL!
So here's what I'm starting to think. About 8-9 months ago, I had a wire running through my door which held the weatherstrip open a bit, and with the front of my car pointing slightly downhill, my entire drivers side floorboard flooded during a very heavy rainstorm (as in about 1-1.5 inches of standing water). I didn't realize it at the time, but the ECU was submerged in water, and caused the car not to start (so yes, it was turned on while underwater). After I got all the water out I took the front and back covers off the ECU and cleaned it off real good, and dried it with a hairdryer on the cool setting. This underwater ECU thing happened a total of 2 times before I figured out what was causing the flooding. Both times I put it back in and it's worked perfectly fine, no problems at all. But perhaps (just by luck) it damaged just a part of the ECU that deals with the A/C (???). I don't know if that's possible or not, but it's the only thing I can think of that kinda makes sense. Anybody think that's possible? Another ECU from the boneyard might be the way to go....
If anybody else had any other ideas on what might be causing this, please share! It doesn't affect driveablity one bit, or a/c. Everything works perfectly normal, cooling fans work just like they should, temp is fine, EVERYTHING'S PERFECT, just that annoying light! It goes off when you restart the car, but sometimes comes back on shortly after, and sometimes doesn't come on at all (depends on conditions listed above).
So anybody got any ideas? My cars brain ain't talkin!
So here's what I'm starting to think. About 8-9 months ago, I had a wire running through my door which held the weatherstrip open a bit, and with the front of my car pointing slightly downhill, my entire drivers side floorboard flooded during a very heavy rainstorm (as in about 1-1.5 inches of standing water). I didn't realize it at the time, but the ECU was submerged in water, and caused the car not to start (so yes, it was turned on while underwater). After I got all the water out I took the front and back covers off the ECU and cleaned it off real good, and dried it with a hairdryer on the cool setting. This underwater ECU thing happened a total of 2 times before I figured out what was causing the flooding. Both times I put it back in and it's worked perfectly fine, no problems at all. But perhaps (just by luck) it damaged just a part of the ECU that deals with the A/C (???). I don't know if that's possible or not, but it's the only thing I can think of that kinda makes sense. Anybody think that's possible? Another ECU from the boneyard might be the way to go....
If anybody else had any other ideas on what might be causing this, please share! It doesn't affect driveablity one bit, or a/c. Everything works perfectly normal, cooling fans work just like they should, temp is fine, EVERYTHING'S PERFECT, just that annoying light! It goes off when you restart the car, but sometimes comes back on shortly after, and sometimes doesn't come on at all (depends on conditions listed above).
So anybody got any ideas? My cars brain ain't talkin!